A large number of ancient five-storied pagoda in Japan has survived strong earthquakes over centuries, proving its structural advantage. Typical structure of pagoda, consisted of self-supporting outer tower and inner core post, yields friction and collision between outer and inner structures.Similar mechanism can be applied to modern buildings excited by earthquakes or strong wind to absorb response energy efficiently.
This paper presents a passive vibration control method, which can be applied to a building connecting its self-supporting center concrete core with outer steel structure by many dampers at selected stories. The optimal distribution of the dampers are driven by weighted modal damping factors over wide range of modes. The presented method is applied to the benchmark structure to show its performance as an efficient passive vibration control system.